Japan Aerospace Exploration Agency

Elecs Industry Co., Ltd.

Takashi Maeda

Naoya Tomii

Kensuke Ozeki

Noriyuki Kawaguchi

Kenichi Harada

Akihisa Uematsu

Kenji Ema

Kazuya Inaoka

A phased-array antenna device with a long operating life without mechanical parts, has a high spatial resolution, and realizes microwave observation of broadband and high-frequency resolution. The phased-array antenna device performs direct A/D conversion through a BPF on an antenna analog signal amplified by an amplifier. Then, the device performs a second cross-spectrum calculation after conversion into complex frequency data through FFT. To detect a weak electromagnetic wave, the device repeatedly performs a second FFT over a long period and lastly performs integration.

Phased-array antenna device

Provided is an AD converter that is capable of converting a wideband noise signal of several GHz or more into a digital signal and that can be used even when an installation space and power supply are severely limited. The AD converter includes: a comparator () configured to compare an input voltage of an analog signal to a determination voltage; an adjustment unit () configured to shift at least one of the input voltage of the analog signal or the determination voltage; an encoder () configured to output time-series data of one bit based on a result of the comparison obtained by the comparator; a processing unit () configured to calculate a frequency of appearance of an output code included in the time-series data; and a control unit () configured to cause the adjustment unit to operate so that a result of the calculation obtained by the processing unit becomes a predetermined value.

AD converter, power measurement device for wideband noise using same, and power spectrum measurement device

A system includes an antenna having a predetermined directivity and a measurement data processing device that modifies spatial resolution of measurement data received from the antenna. The device includes a plurality of multipliers that multiply together measurement values, which are the signal intensity of the microwave output by the microwave radiometer, and weighting coefficients to be an element of a weighted vector a and output multiplication results; and an integrator that integrates the multiplication results of the plurality of multipliers. The weighted vector a modifies the accuracy of the corrected sensitivity function Φ(x,y) with performance of the arithmetic processing of the inverse problem in order to reduce integrated values of a positive value region and a negative value region present on an outer side of the sensitivity distribution of the target antenna sensitivity distribution function F(x,y) in the corrected sensitivity function Φ(x,y).

Measurement data processing device

Growing community of inventors

Chofu, Japan

Takashi Maeda